JP2018047411A - Method for regenerating photocatalyst deodorization material, photocatalyst deodorization material regeneration system, and method for producing regenerated photocatalyst deodorization material - Google Patents
Method for regenerating photocatalyst deodorization material, photocatalyst deodorization material regeneration system, and method for producing regenerated photocatalyst deodorization material Download PDFInfo
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 12
- 238000004332 deodorization Methods 0.000 title abstract description 23
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- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 claims description 4
- 235000011054 acetic acid Nutrition 0.000 claims description 4
- 239000003463 adsorbent Substances 0.000 claims description 4
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- BJEPYKJPYRNKOW-REOHCLBHSA-N (S)-malic acid Chemical compound OC(=O)[C@@H](O)CC(O)=O BJEPYKJPYRNKOW-REOHCLBHSA-N 0.000 claims description 3
- RGHNJXZEOKUKBD-UHFFFAOYSA-N D-gluconic acid Natural products OCC(O)C(O)C(O)C(O)C(O)=O RGHNJXZEOKUKBD-UHFFFAOYSA-N 0.000 claims description 3
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 claims description 3
- BJEPYKJPYRNKOW-UHFFFAOYSA-N alpha-hydroxysuccinic acid Natural products OC(=O)C(O)CC(O)=O BJEPYKJPYRNKOW-UHFFFAOYSA-N 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims description 3
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
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- SNICXCGAKADSCV-JTQLQIEISA-N (-)-Nicotine Chemical compound CN1CCC[C@H]1C1=CC=CN=C1 SNICXCGAKADSCV-JTQLQIEISA-N 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
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- 229960002715 nicotine Drugs 0.000 description 1
- SNICXCGAKADSCV-UHFFFAOYSA-N nicotine Natural products CN1CCCC1C1=CC=CN=C1 SNICXCGAKADSCV-UHFFFAOYSA-N 0.000 description 1
- QGLKJKCYBOYXKC-UHFFFAOYSA-N nonaoxidotritungsten Chemical compound O=[W]1(=O)O[W](=O)(=O)O[W](=O)(=O)O1 QGLKJKCYBOYXKC-UHFFFAOYSA-N 0.000 description 1
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- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Catalysts (AREA)
Abstract
Description
本発明は光触媒脱臭材料再生方法、光触媒脱臭材料再生システム、および再生済み光触媒脱臭材料製造方法に係り、特に、空気浄化にて使用される光触媒脱臭材料の再生方法等に関するものである。 The present invention relates to a photocatalyst deodorant material regeneration method, a photocatalyst deodorant material regeneration system, and a regenerated photocatalyst deodorant material production method, and more particularly to a method of regenerating a photocatalyst deodorant material used in air purification.
空気浄化を目的として光触媒を使用した場合、有機化合物は水と二酸化炭素に分解されるが、難分解性物質（塵埃、高分子化合物、無機化合物等）は光触媒表面に堆積してこれを覆ってしまう。そのために光が光触媒に届かなくなり、光触媒性能が低下する。特にタバコ煙には、難分解性物質でありかつ主要なヤニ成分であるタール、ニコチンが含まれており、喫煙室等の大量のタバコ煙が発生する環境で使用すると、著しく性能が低下してしまう。そのため、光触媒性能を維持するには、表面に堆積した難分解性物質を定期的に洗浄除去することが望ましい。 When a photocatalyst is used for the purpose of air purification, organic compounds are decomposed into water and carbon dioxide, but hardly decomposable substances (dust, polymer compounds, inorganic compounds, etc.) are deposited on the surface of the photocatalyst and cover it. End up. Therefore, light does not reach the photocatalyst, and the photocatalytic performance decreases. In particular, cigarette smoke contains tar and nicotine, which are hardly decomposable substances and the main ingredients, and when used in an environment where a large amount of cigarette smoke is generated such as in a smoking room, the performance is significantly reduced. End up. Therefore, in order to maintain the photocatalytic performance, it is desirable to periodically wash away the hardly decomposable substance deposited on the surface.
さて、光触媒再生方法については従来、技術的な提案も多くなされている。たとえば後掲特許文献１には、大気中に浮遊する高分子化合物および塵埃などに覆われた光触媒表面の汚染物質を除去する方法として、紫外線を照射して再生する方法が、また特許文献２には、酸化剤と界面活性剤で洗浄して再生する方法が、また特許文献３にはアルカリ洗浄液で洗浄して再生する方法が、それぞれ開示されている。 Many technical proposals have been made for photocatalyst regeneration methods. For example, in Patent Document 1 described later, as a method for removing contaminants on the surface of a photocatalyst covered with a polymer compound and dust that floats in the atmosphere, a method of regenerating by irradiating with ultraviolet rays is disclosed in Patent Document 2. Discloses a method of regenerating by washing with an oxidizing agent and a surfactant, and Patent Document 3 discloses a method of regenerating by cleaning with an alkaline cleaning solution.
しかしながら紫外線を照射して再生する方法では、光触媒表面に堆積している難分解性物質を完全に除去することは困難である。また、酸化剤と界面活性剤で洗浄して再生する方法では、酸化剤の腐食性が強いため、光触媒の基材として金属を用いる場合には洗浄剤として適さない。しかも、酸化剤である過炭酸化合物や塩素酸化合物および界面活性剤は、洗浄する際に光触媒表面に付着して残留するため、光触媒性能が低下してしまう。 However, in the method of regenerating by irradiating with ultraviolet rays, it is difficult to completely remove the hardly decomposable substance deposited on the surface of the photocatalyst. Further, the method of washing and regenerating with an oxidizing agent and a surfactant is not suitable as a cleaning agent when a metal is used as the base material of the photocatalyst because the oxidizing agent is highly corrosive. In addition, since the percarbonate compound, chloric acid compound, and surfactant, which are oxidizing agents, remain attached to the surface of the photocatalyst during cleaning, the photocatalytic performance is degraded.
また、アルカリ洗浄液で再生する方法は、タバコ煙の付着成分を除去することはできるものの、洗浄液に含まれるアルカリ成分が光触媒表面に残留するため、これらが光触媒反応の阻害因子になり、性能が低下してしまう。すなわち、従来技術のいずれの方法も、タバコ煙が吸着して性能が低下した光触媒を再生する方法としては不十分である。 In addition, although the method of regenerating with an alkaline cleaning solution can remove the adhering components of tobacco smoke, the alkali component contained in the cleaning solution remains on the photocatalyst surface, which becomes an inhibitory factor for the photocatalytic reaction, resulting in a decrease in performance. Resulting in. That is, any of the conventional methods is insufficient as a method for regenerating a photocatalyst whose performance has been reduced due to adsorption of tobacco smoke.
そこで本発明が解決しようとする課題は、かかる従来技術の問題点をなくし、タバコ煙などの汚染により性能低下した光触媒脱臭材料を効率よく十分に再生することのできる、光触媒脱臭材料再生方法、光触媒脱臭材料再生システム、および再生済み光触媒脱臭材料製造方法を提供することである。 Therefore, the problem to be solved by the present invention is to eliminate the above-mentioned problems of the prior art and to efficiently and sufficiently regenerate the photocatalyst deodorizing material whose performance has been deteriorated due to contamination such as tobacco smoke. A deodorizing material regeneration system and a regenerated photocatalyst deodorizing material manufacturing method are provided.
本願発明者は上記課題について検討した結果、酸性水溶液で光触媒脱臭材料を洗浄した後に、光触媒が励起する波長の光を照射することによって解決できることを見出し、これに基づいて本発明を完成するに至った。すなわち、上記課題を解決するための手段として本願で特許請求される発明、もしくは少なくとも開示される発明は、以下の通りである。 As a result of studying the above problems, the present inventor has found that the photocatalyst deodorizing material is washed with an acidic aqueous solution and then irradiated with light having a wavelength excited by the photocatalyst. Based on this, the present invention has been completed. It was. That is, the invention claimed in the present application, or at least the disclosed invention, as means for solving the above-described problems is as follows.
〔１〕 空気浄化に用いられ、除去されなかった物質の堆積により性能低下した光触媒脱臭材料を再生する方法であって、酸性水溶液を用いて光触媒脱臭材料を洗浄する洗浄過程と、洗浄後の光触媒脱臭材料に光触媒が励起する波長の光を照射する照射過程とを備えることを特徴とする、光触媒脱臭材料再生方法。
〔２〕 前記酸性水溶液には有機酸が含有されることを特徴とする、〔１〕に記載の光触媒脱臭材料再生方法。
〔３〕 前記有機酸として、クエン酸、酢酸、乳酸、酒石酸、グリコール酸、リンゴ酸、シュウ酸またはグルコン酸の少なくともいずれかが含有されることを特徴とする、〔２〕に記載の光触媒脱臭材料再生方法。
〔４〕 前記酸性水溶液の濃度が０．１重量％以上５０重量％以下であることを特徴とする、〔１〕ないし〔３〕のいずれかに記載の光触媒脱臭材料再生方法。
[1] A method for regenerating a photocatalyst deodorizing material that has been used for air purification and whose performance has deteriorated due to accumulation of substances that have not been removed, and a cleaning process for cleaning the photocatalytic deodorizing material using an acidic aqueous solution, and a photocatalyst after cleaning A method for regenerating a photocatalyst deodorizing material, comprising: irradiating light having a wavelength at which the photocatalyst is excited to the deodorizing material.
[2] The photocatalyst deodorizing material regeneration method according to [1], wherein the acidic aqueous solution contains an organic acid.
[3] The photocatalytic deodorization according to [2], wherein the organic acid contains at least one of citric acid, acetic acid, lactic acid, tartaric acid, glycolic acid, malic acid, oxalic acid, or gluconic acid. Material recycling method.
[4] The method for regenerating a photocatalyst deodorizing material according to any one of [1] to [3], wherein the concentration of the acidic aqueous solution is 0.1 wt% or more and 50 wt% or less.
〔５〕 前記洗浄過程後に、前記光触媒脱臭材料を水で洗浄し乾燥する水洗乾燥過程が設けられていることを特徴とする、〔１〕ないし〔４〕のいずれかに記載の光触媒脱臭材料再生方法。
〔６〕 前記洗浄過程では、酸性水溶液の加熱または超音波発生を用いながら前記光触媒脱臭材料を洗浄することを特徴とする、〔１〕ないし〔５〕のいずれかに記載の光触媒脱臭材料再生方法。
〔７〕 前記光触媒脱臭材料が光触媒単体、または、これに少なくとも吸着剤もしくは助触媒のいずれかが加えられた複合材料であることを特徴とする、〔１〕ないし〔６〕のいずれかに記載の光触媒脱臭材料再生方法。
〔８〕 前記光触媒脱臭材料の性能を低下させる堆積物質がタバコ煙であることを特徴とする、〔１〕ないし〔７〕のいずれかに記載の光触媒脱臭材料再生方法。
[5] The regeneration of the photocatalyst deodorizing material according to any one of [1] to [4], wherein after the cleaning step, a water washing drying process is performed in which the photocatalyst deodorizing material is washed with water and dried. Method.
[6] The photocatalyst deodorizing material regeneration method according to any one of [1] to [5], wherein the photocatalyst deodorizing material is washed using heating of an acidic aqueous solution or ultrasonic generation in the washing process. .
[7] The photocatalyst deodorizing material is a photocatalyst alone or a composite material in which at least one of an adsorbent or a cocatalyst is added to the photocatalyst deodorizing material, according to any one of [1] to [6] Of regenerating photocatalytic deodorizing material
[8] The method for regenerating a photocatalyst deodorizing material according to any one of [1] to [7], wherein the deposited substance that reduces the performance of the photocatalytic deodorizing material is tobacco smoke.
〔９〕 空気浄化に用いられ、除去されなかった物質の堆積により性能低下した光触媒脱臭材料を再生するシステムであって、酸性水溶液を用いて光触媒脱臭材料を洗浄する洗浄部と、洗浄後の光触媒脱臭材料に光触媒が励起する波長の光を照射する照射部とを備えることを特徴とする、光触媒脱臭材料再生システム。
〔１０〕 前記洗浄部と照射部との間に、前記光触媒脱臭材料を水で洗浄し乾燥する水洗乾燥部が設けられていることを特徴とする、〔９〕に記載の光触媒脱臭材料再生システム。
〔１１〕 前記洗浄部には酸性水溶液の加熱手段または超音波発生手段が備えられていることを特徴とする、〔９〕または〔１０〕に記載の光触媒脱臭材料再生システム。
〔１２〕 空気浄化に用いられ、除去されなかった物質の堆積により性能低下した光触媒脱臭材料を元に再生済み材料を製造する方法であって、酸性水溶液を用いて光触媒脱臭材料を洗浄する洗浄過程と、洗浄後の光触媒脱臭材料に光触媒が励起する波長の光を照射する照射過程とを備えることを特徴とする、再生済み光触媒脱臭材料製造方法。
[9] A system for regenerating a photocatalyst deodorizing material that has been used for air purification and whose performance has deteriorated due to accumulation of substances that have not been removed, a cleaning unit that cleans the photocatalytic deodorizing material using an acidic aqueous solution, and a photocatalyst after cleaning A photocatalyst deodorizing material regeneration system comprising: an irradiating unit that irradiates light having a wavelength at which the photocatalyst is excited to the deodorizing material.
[10] The photocatalyst deodorizing material regeneration system according to [9], wherein a water washing / drying unit for washing the photocatalyst deodorizing material with water and drying is provided between the cleaning unit and the irradiation unit. .
[11] The photocatalyst deodorizing material regeneration system according to [9] or [10], wherein the cleaning unit is provided with an acidic aqueous solution heating means or an ultrasonic wave generation means.
[12] A method for producing a regenerated material based on a photocatalyst deodorizing material whose performance has deteriorated due to deposition of substances that have been used for air purification and has not been removed, and a washing process for washing the photocatalytic deodorizing material using an acidic aqueous solution And an irradiation process of irradiating the photocatalyst deodorizing material after washing with light having a wavelength that excites the photocatalyst.
本発明の光触媒脱臭材料再生方法、光触媒脱臭材料再生システム、および再生済み光触媒脱臭材料製造方法は上述のように構成されるため、これらによれば、タバコ煙などの汚染により性能低下した光触媒脱臭材料を効率よく十分に再生することができる。従来の、光照射のみでの再生方法では十分な再生効果が得られなかったという問題、また、アルカリ洗浄剤での再生方法ではアルカリ成分の表面残留による触媒活性の失活が生じるという問題はいずれも、本発明によって解決することができる。 Since the photocatalyst deodorization material regeneration method, photocatalyst deodorization material regeneration system, and regenerated photocatalyst deodorization material production method of the present invention are configured as described above, according to these, the photocatalyst deodorization material whose performance is deteriorated due to contamination such as tobacco smoke Can be efficiently and fully reproduced. The problem that the conventional regeneration method using only light irradiation did not provide a sufficient regeneration effect, and the regeneration method using an alkaline detergent caused the deactivation of the catalytic activity due to the residual surface of the alkali component. Can also be solved by the present invention.
以下、図面により本発明を詳細に説明する。
図１は、本発明の光触媒脱臭材料再生方法の基本構成を示すフロー図である。図示するように本光触媒材料再生方法は、空気浄化に用いられ、除去されなかった物質の堆積により性能低下した、処理対象であるところの光触媒脱臭材料１を再生する方法であって、酸性水溶液２を用いて処理対象光触媒脱臭材料１を浸漬等適宜の方法によって洗浄する洗浄過程Ｐ１と、洗浄後の光触媒脱臭材料３に光触媒が励起する波長の光（励起光４）を照射する照射過程Ｐ３とを備えることを、基本的な構成とする。なお本発明では、光触媒脱臭材料の性能を低下させる堆積物質として、主にタバコ煙を想定しているが、本発明がそれに限定されるものではない。
The present invention will be described in detail below with reference to the drawings.
FIG. 1 is a flowchart showing the basic structure of the photocatalyst deodorizing material regeneration method of the present invention. As shown in the figure, the present photocatalyst material regeneration method is a method for regenerating the photocatalyst deodorizing material 1 to be treated, which has been used for air purification and whose performance has been deteriorated due to deposition of substances that have not been removed. A cleaning process P1 for cleaning the processing target photocatalyst deodorizing material 1 by an appropriate method such as immersion, and an irradiation process P3 for irradiating the cleaned photocatalyst deodorizing material 3 with light having a wavelength that excites the photocatalyst (excitation light 4). It is assumed that a basic configuration is provided. In the present invention, cigarette smoke is mainly assumed as a deposited substance that lowers the performance of the photocatalytic deodorizing material, but the present invention is not limited thereto.
洗浄過程Ｐ１に用いる酸性水溶液２としては、有機酸がより好ましい。一または複数種類の有機酸が含有された酸性水溶液２とすることができる。有機酸としてはたとえば、クエン酸、酢酸、乳酸、酒石酸、グリコール酸、リンゴ酸、シュウ酸、またはグルコン酸の少なくともいずれかを、好適に用いることができ、その中でも特にクエン酸が好ましい。酸性水溶液２中の有機酸は、０．１〜５０重量％の濃度範囲で含まれるように調整すればよい。なお、無機酸は、洗浄の際に表面に付着して残留し、光触媒性能が低下するため、使用は推奨されない。 As the acidic aqueous solution 2 used in the cleaning process P1, an organic acid is more preferable. The acidic aqueous solution 2 containing one or more kinds of organic acids can be obtained. As the organic acid, for example, at least one of citric acid, acetic acid, lactic acid, tartaric acid, glycolic acid, malic acid, oxalic acid, and gluconic acid can be suitably used, and citric acid is particularly preferable among them. What is necessary is just to adjust the organic acid in the acidic aqueous solution 2 so that it may be contained in the concentration range of 0.1 to 50% by weight. Inorganic acids adhere to the surface during cleaning and remain, and the photocatalytic performance decreases, so use is not recommended.
かかる構成により本光触媒脱臭材料再生方法では、処理対象光触媒脱臭材料１は、まず洗浄過程Ｐ１において酸性水溶液２により洗浄され、洗浄後の光触媒脱臭材料３は、照射過程Ｐ３において励起光４が照射されることによって光触媒が励起せしめられる。各過程Ｐ１、Ｐ３を経ることによって、空気浄化に用いられ、除去されなかった物質の堆積により性能低下した処理対象光触媒脱臭材料１が再生され、再生済み光触媒脱臭材料５が得られる。 With this configuration, in the photocatalyst deodorizing material regeneration method, the processing target photocatalyst deodorizing material 1 is first washed with the acidic aqueous solution 2 in the washing process P1, and the photocatalyst deodorizing material 3 after washing is irradiated with the excitation light 4 in the irradiation process P3. As a result, the photocatalyst is excited. By passing through each process P1 and P3, the processing target photocatalyst deodorizing material 1 that has been used for air purification and whose performance has been degraded by the deposition of substances that have not been removed is regenerated, and the regenerated photocatalyst deodorizing material 5 is obtained.
洗浄過程Ｐ１を経た洗浄後の光触媒脱臭材料３では、酸洗浄により除去し得る物質が除去された後も、表面にタバコ煙成分の一部である有機成分が残留している。そこで、洗浄後の光触媒脱臭材料３を照射過程Ｐ３に供して励起光４を照射するのだが、これによって、光触媒脱臭材料３の表面に吸着している有機成分が分解され、表面が再生されて、再生済み光触媒脱臭材料５が得られる。 In the photocatalyst deodorizing material 3 after washing that has passed through the washing process P1, an organic component that is a part of the tobacco smoke component remains on the surface even after the substance that can be removed by acid washing is removed. Therefore, the photocatalyst deodorizing material 3 after washing is subjected to the irradiation process P3 and irradiated with the excitation light 4, but the organic components adsorbed on the surface of the photocatalytic deodorizing material 3 are decomposed and the surface is regenerated. Thus, the regenerated photocatalyst deodorizing material 5 is obtained.
光触媒脱臭材料としては、光触媒単体でもよく、また、吸着剤もしくは助触媒等の少なくともいずれかを含有した複合材料であってもよい。光触媒としては、光照射により触媒作用を示す物質であれば、全て用いることができる。たとえば、酸化チタン、酸化タングステン、酸化亜鉛などが挙げられる。 The photocatalyst deodorizing material may be a single photocatalyst or a composite material containing at least one of an adsorbent or a cocatalyst. Any photocatalyst can be used as long as it is a substance that exhibits a catalytic action when irradiated with light. For example, titanium oxide, tungsten oxide, zinc oxide and the like can be mentioned.
図２は、本発明の光触媒脱臭材料再生方法の別の基本構成を示すフロー図である。図示するように本フローは、洗浄過程Ｐ１後に、光触媒脱臭材料を水で洗浄し乾燥する水洗乾燥過程Ｐ２が設けられている構成とすることができる。つまり、洗浄過程Ｐ１における酸性水溶液２による洗浄後、光触媒脱臭材料の表面に残留している酸を除去するために、水で洗浄するものである。使用する水はたとえば、蒸留水や脱イオン水などの純水、水道水などである。水に浸漬することで、光触媒脱臭材料の表面に残留している酸が水中に溶解し、除去される。酸を除去した後の光触媒脱臭材料は乾燥させてから照射過程Ｐ３に供する。 FIG. 2 is a flowchart showing another basic configuration of the photocatalyst deodorizing material regeneration method of the present invention. As shown in the drawing, the present flow can be configured to have a water washing and drying process P2 for washing the photocatalyst deodorizing material with water and drying it after the washing process P1. That is, after washing with the acidic aqueous solution 2 in the washing process P1, washing is performed with water in order to remove the acid remaining on the surface of the photocatalytic deodorizing material. Examples of the water used include pure water such as distilled water and deionized water, and tap water. By dipping in water, the acid remaining on the surface of the photocatalyst deodorizing material is dissolved in water and removed. The photocatalyst deodorizing material after removing the acid is dried and then subjected to the irradiation process P3.
なお、洗浄過程Ｐ１では、処理対象光触媒脱臭材料１が酸性水溶液２に浸漬等されると、処理対象光触媒脱臭材料１に吸着しているタバコ煙の成分が溶出するが、その際に、酸性水溶液２を加熱しながら、または超音波を発生させながら処理することとしてもよい。これにより洗浄力が高まり、洗浄時間を短くなすることができる。 In the cleaning process P1, when the processing target photocatalyst deodorizing material 1 is immersed in the acidic aqueous solution 2, components of tobacco smoke adsorbed on the processing target photocatalyst deodorizing material 1 are eluted. It is good also as processing, heating 2 or generating an ultrasonic wave. As a result, the cleaning power is increased and the cleaning time can be shortened.
図３は、本発明の光触媒脱臭材料再生システムの基本構成を示す概念図である。図示するように本光触媒脱臭材料再生システム１００は、酸性水溶液を用いて光触媒脱臭材料を洗浄する洗浄部１０と、洗浄後の光触媒脱臭材料に光触媒が励起する波長の光を照射する照射部３０とを備えることを、基本的な構成とする。なお、図示するように、洗浄部１０と照射部３０との間に、光触媒脱臭材料を水で洗浄し乾燥する水洗乾燥部２０を設けた構成とすることができる。 FIG. 3 is a conceptual diagram showing the basic configuration of the photocatalyst deodorizing material regeneration system of the present invention. As shown in the figure, the photocatalyst deodorizing material regeneration system 100 includes a cleaning unit 10 that cleans the photocatalyst deodorizing material using an acidic aqueous solution, and an irradiation unit 30 that irradiates the washed photocatalyst deodorizing material with light having a wavelength that excites the photocatalyst. It is assumed that a basic configuration is provided. In addition, as shown in the figure, it is possible to employ a configuration in which a washing / drying unit 20 for washing the photocatalyst deodorizing material with water and drying it is provided between the washing unit 10 and the irradiation unit 30.
かかる構成により本光触媒脱臭材料再生システム１００では、処理対象の光触媒脱臭材料は洗浄部１０において酸性水溶液を用いて洗浄処理され、洗浄処理後の光触媒脱臭材料は照射部３０において励起光照射処理され、最終的に再生済み光触媒脱臭材料が得られる。なお、水洗乾燥部２０が備えられていることにより、洗浄処理後の光触媒脱臭材料は水で洗浄処理されて酸が除去され、その後乾燥されてから、照射部３０に供され、励起光照射処理される。かかる作用により、空気浄化に用いられ除去されなかった物質の堆積により性能低下した光触媒脱臭材料が再生される。 With this configuration, in the present photocatalyst deodorizing material regeneration system 100, the photocatalyst deodorizing material to be processed is cleaned using an acidic aqueous solution in the cleaning unit 10, and the photocatalyst deodorizing material after the cleaning processing is subjected to excitation light irradiation processing in the irradiation unit 30, Finally, a regenerated photocatalyst deodorizing material is obtained. Since the water washing and drying unit 20 is provided, the photocatalyst deodorizing material after the washing treatment is washed with water to remove the acid, and then dried, and then supplied to the irradiation unit 30 to be excited light irradiation treatment. Is done. By such an action, the photocatalyst deodorizing material whose performance is deteriorated due to the deposition of substances that have been used for air purification and not removed is regenerated.
なお、本光触媒脱臭材料再生システム１００の洗浄部１０には、酸性水溶液の加熱手段または超音波発生手段を備えた構成とすることができる。これにより洗浄部１０における処理対象光触媒脱臭材料に対する洗浄力が高まり、洗浄時間を短くすることができる。 The cleaning unit 10 of the present photocatalyst deodorizing material regeneration system 100 can be configured to include a heating means or an ultrasonic wave generation means for an acidic aqueous solution. Thereby, the cleaning power with respect to the process target photocatalyst deodorizing material in the cleaning unit 10 is increased, and the cleaning time can be shortened.
また、空気浄化に用いられ除去されなかった物質の堆積により性能低下した光触媒脱臭材料を元に再生済み材料を製造する方法であって、酸性水溶液を用いて光触媒脱臭材料を洗浄する洗浄過程と、洗浄後の光触媒脱臭材料に光触媒が励起する波長の光を照射する照射過程とを備える再生済み光触媒脱臭材料製造方法も、本発明の範囲内である。 Further, a method for producing a regenerated material based on a photocatalyst deodorizing material whose performance has been reduced due to accumulation of substances that have not been removed and used for air purification, and a cleaning process for cleaning the photocatalyst deodorizing material using an acidic aqueous solution, A regenerated photocatalyst deodorizing material manufacturing method comprising an irradiation process of irradiating the photocatalyst deodorizing material after cleaning with light having a wavelength excited by the photocatalyst is also within the scope of the present invention.
図４は、光触媒脱臭材料再生方法の実施例の構成を示すフロー図である。以下、本発明を実施例により説明するが、本発明がこれらに限定されるものではない。
実施例１
光触媒脱臭材料は、シリカ不織布（７５ｍｍ×７５ｍｍ）に酸化チタン光触媒と吸着剤を混合した溶液を塗布して成膜したものを使用した。ガラスデシケーターに光触媒脱臭材料を置き、ファンで空間を撹拌しながら、タバコ５本分の煙を発生させ、前記光触媒脱臭材料にタバコ煙を吸着させた。次に、酸性水溶液による洗浄処理として、クエン酸水溶液（２重量％）５００ｇにタバコ煙を吸着させた光触媒脱臭材料を２時間浸漬した。その後、光触媒脱臭材料に残留している酸を除去するため、水５００ｇに１５時間浸漬し、すすぎ洗いをして、乾燥機で５０℃３時間乾燥した（水洗処理、乾燥処理）。次に、紫外線（ケミカルランプ）を２４時間照射した（照射処理）。
FIG. 4 is a flowchart showing the configuration of an embodiment of the photocatalyst deodorizing material regeneration method. EXAMPLES Hereinafter, although an Example demonstrates this invention, this invention is not limited to these.
Example 1
As the photocatalyst deodorizing material, a silica non-woven fabric (75 mm × 75 mm) coated with a mixed solution of a titanium oxide photocatalyst and an adsorbent was used. A photocatalyst deodorizing material was placed on a glass desiccator, and smoke was generated for 5 cigarettes while stirring the space with a fan, and the tobacco smoke was adsorbed on the photocatalyst deodorizing material. Next, as a cleaning treatment with an acidic aqueous solution, a photocatalyst deodorizing material in which tobacco smoke was adsorbed in 500 g of citric acid aqueous solution (2 wt%) was immersed for 2 hours. Then, in order to remove the acid remaining in the photocatalyst deodorizing material, it was immersed in 500 g of water for 15 hours, rinsed, and dried at 50 ° C. for 3 hours (water washing treatment, drying treatment). Next, ultraviolet rays (chemical lamps) were irradiated for 24 hours (irradiation treatment).
実施例２
光触媒脱臭材料は、シリカ不織布（７５ｍｍ×７５ｍｍ）に酸化チタン光触媒分散液を塗布して成膜したものを使用した。それ以外は実施例１と同様にして、タバコ煙を吸着させた光触媒脱臭材料を洗浄処理等した。
実施例３
実施例１のクエン酸水溶液を、乳酸水溶液（２重量％）にした以外は実施例１と同様にして、タバコ煙が吸着した光触媒脱臭材料を洗浄処理等した。
Example 2
As the photocatalyst deodorizing material, a silica non-woven fabric (75 mm × 75 mm) coated with a titanium oxide photocatalyst dispersion was used. Other than that was carried out similarly to Example 1, and wash | cleaned the photocatalyst deodorizing material which adsorb | sucked tobacco smoke.
Example 3
The photocatalyst deodorizing material adsorbed with tobacco smoke was washed in the same manner as in Example 1 except that the citric acid aqueous solution of Example 1 was changed to a lactic acid aqueous solution (2% by weight).
実施例４
実施例１のクエン酸水溶液を、酢酸水溶液（２重量％）にした以外は実施例１と同様にして、タバコ煙が吸着した光触媒脱臭材料を洗浄処理等した。
実施例５
実施例１のクエン酸水溶液を、酒石酸水溶液（２重量％）にした以外は実施例１と同様にして、タバコ煙が吸着した光触媒脱臭材料を洗浄処理等した。
実施例６
実施例１のクエン酸水溶液を、しゅう酸水溶液（２重量％）にした以外は実施例１と同様にして、タバコ煙が吸着した光触媒脱臭材料を洗浄処理等した。
実施例７
光触媒脱臭材料は、金属多孔質体（７５ｍｍ×７５ｍｍ）に酸化チタン光触媒分散液を塗布して成膜したものを使用した。それ以外は実施例1と同様にして、タバコ煙を吸着させた光触媒脱臭材料を洗浄処理した。
Example 4
The photocatalyst deodorizing material adsorbed with tobacco smoke was washed in the same manner as in Example 1 except that the citric acid aqueous solution of Example 1 was changed to an acetic acid aqueous solution (2 wt%).
Example 5
The photocatalyst deodorizing material adsorbed with cigarette smoke was washed in the same manner as in Example 1 except that the citric acid aqueous solution of Example 1 was changed to a tartaric acid aqueous solution (2% by weight).
Example 6
The photocatalyst deodorizing material adsorbed with cigarette smoke was washed in the same manner as in Example 1 except that the citric acid aqueous solution of Example 1 was changed to an oxalic acid aqueous solution (2% by weight).
Example 7
As the photocatalyst deodorizing material, a metal porous body (75 mm × 75 mm) coated with a titanium oxide photocatalyst dispersion was used. Except for this, the photocatalyst deodorizing material adsorbing tobacco smoke was washed in the same manner as in Example 1.
比較例１
実施例１のクエン酸水溶液を、アルカリ洗浄剤（１０重量％、横浜油脂工業（株）製シルバーマイルド）にした以外は実施例１と同様にして、タバコ煙が吸着した光触媒脱臭材料を洗浄処理等した。
比較例２
光触媒脱臭材料を、実施例２と同様のものを使用した以外は比較例１と同様にして、タバコ煙が吸着した光触媒脱臭材料を洗浄処理等した。
比較例３
実施例１のクエン酸水溶液を、炭酸ナトリウム水溶液（２重量％）にした以外は実施例１と同様にして、タバコ煙が吸着した光触媒脱臭材料を洗浄処理等した。
比較例４
実施例１のクエン酸水溶液を、塩素系漂白剤（０．２体積％、花王（株）製キッチンハイター）５００ｍｌにした以外は実施例１と同様にして、タバコ煙が吸着した光触媒脱臭材料を洗浄処理等した。
Comparative Example 1
The photocatalyst deodorizing material adsorbed with tobacco smoke was washed in the same manner as in Example 1 except that the aqueous citric acid solution of Example 1 was replaced with an alkaline detergent (10% by weight, silver mild manufactured by Yokohama Oil & Fats Co., Ltd.). And so on.
Comparative Example 2
The photocatalyst deodorizing material adsorbed with tobacco smoke was washed in the same manner as in Comparative Example 1 except that the same photocatalyst deodorizing material as in Example 2 was used.
Comparative Example 3
The photocatalyst deodorizing material adsorbed with tobacco smoke was washed in the same manner as in Example 1 except that the aqueous citric acid solution of Example 1 was changed to an aqueous sodium carbonate solution (2% by weight).
Comparative Example 4
A photocatalytic deodorizing material adsorbed with tobacco smoke was obtained in the same manner as in Example 1 except that the aqueous citric acid solution of Example 1 was changed to 500 ml of a chlorine bleach (0.2% by volume, kitchen hitter manufactured by Kao Corporation). It was washed.
比較例５
実施例１の紫外線の照射処理を行わない以外は、実施例１と同様にして、タバコ煙が吸着した光触媒脱臭材料を洗浄処理等した。
比較例６
実施例１のタバコ煙が吸着した光触媒脱臭材料を用い、クエン酸水溶液に浸漬する工程（洗浄処理）と水に浸漬する工程（水洗処理）とをいずれも行わずに、紫外線（ケミカルランプ）を２４時間照射して、タバコ煙が吸着した光触媒脱臭材料を処理した。
Comparative Example 5
The photocatalyst deodorizing material adsorbed with cigarette smoke was washed in the same manner as in Example 1 except that the ultraviolet irradiation treatment of Example 1 was not performed.
Comparative Example 6
Using the photocatalyst deodorizing material adsorbed with the tobacco smoke of Example 1, ultraviolet rays (chemical lamps) were used without performing both the step of immersing in an aqueous citric acid solution (cleaning treatment) and the step of immersing in water (water washing treatment). Irradiated for 24 hours, the photocatalytic deodorizing material adsorbed with tobacco smoke was treated.
上記方法で洗浄した光触媒脱臭材料について、アセトアルデヒドの脱臭性能評価を行った。評価方法は、２０Ｌの反応容器内に試料を設置し、アセトアルデヒド約２０ｐｐｍを注入後、ブラックライト照射時のアセトアルデヒドの濃度減少を測定した。初期濃度約２０ｐｐｍから１ｐｐｍ以下になるまでに要する時間から、性能維持率を算出し、評価した。 The deodorizing performance of acetaldehyde was evaluated for the photocatalyst deodorizing material washed by the above method. In the evaluation method, a sample was placed in a 20 L reaction vessel, about 20 ppm of acetaldehyde was injected, and the concentration reduction of acetaldehyde during irradiation with black light was measured. The performance maintenance ratio was calculated and evaluated from the time required to reach an initial concentration of about 20 ppm to 1 ppm or less.
表１に、各実施例および比較例の評価結果をまとめて示す。ここに示すように、実施例１〜６で洗浄した試料は、いずれも性能維持率８５％以上となった。また、基材に金属多孔質体を用いた実施例７においても性能維持率８５％以上となり、金属腐食による性能低下は見られなかった。一方、アルカリ性溶液で洗浄した比較例１〜４は、性能維持率が５０％以下となった。クエン酸水溶液での洗浄処理は行ったが、紫外線照射処理を行わなかった比較例５は、性能維持率が４０％となった。また、洗浄処理および水洗処理を実施せず、紫外線照射処理のみを行った比較例６は、性能維持率が約４９％で性能回復が不十分であった。 Table 1 summarizes the evaluation results of each example and comparative example. As shown here, the samples cleaned in Examples 1 to 6 all had a performance maintenance rate of 85% or more. Moreover, also in Example 7 using a metal porous body as a base material, the performance retention rate was 85% or more, and no performance degradation due to metal corrosion was observed. On the other hand, Comparative Examples 1 to 4 washed with an alkaline solution had a performance maintenance rate of 50% or less. In Comparative Example 5 in which the washing treatment with the citric acid aqueous solution was performed but the ultraviolet irradiation treatment was not performed, the performance maintenance ratio was 40%. In Comparative Example 6 in which only the ultraviolet irradiation treatment was performed without performing the washing treatment and the water washing treatment, the performance maintenance ratio was about 49% and the performance recovery was insufficient.
本発明の光触媒脱臭材料再生方法、光触媒脱臭材料再生システム、および再生済み光触媒脱臭材料製造方法によれば、タバコ煙の汚染により性能低下した光触媒脱臭材料を、効率よく十分に再生することができ、その効果は従来技術の効果に大きく優る。したがって、空気浄化機製造分野、および関連する全分野において、産業上利用性が高い発明である。 According to the photocatalyst deodorant material regeneration method, photocatalyst deodorant material regeneration system, and regenerated photocatalyst deodorant material production method of the present invention, the photocatalyst deodorant material whose performance has deteriorated due to tobacco smoke contamination can be efficiently and sufficiently regenerated, The effect is greatly superior to that of the prior art. Therefore, the invention is highly industrially applicable in the field of manufacturing the air purifier and all related fields.
１…処理対象光触媒脱臭材料
２…酸性水溶液
３…洗浄後の光触媒脱臭材料
４…励起光
５…再生済み光触媒脱臭材料
１０…洗浄部
２０…水洗乾燥部
３０…照射部
１００…光触媒脱臭材料再生システム
Ｐ１…洗浄過程
Ｐ２…水洗乾燥過程
Ｐ３…照射過程
DESCRIPTION OF SYMBOLS 1 ... Processing target photocatalyst deodorization material 2 ... Acidic aqueous solution 3 ... Photocatalyst deodorization material 4 after washing | cleaning ... Excitation light 5 ... Regenerated photocatalyst deodorization material 10 ... Washing part 20 ... Water washing drying part 30 ... Irradiation part 100 ... Photocatalyst deodorization material reproduction | regeneration system P1 ... Washing process P2 ... Washing and drying process P3 ... Irradiation process
Claims (12)
A method for producing a regenerated material based on a photocatalyst deodorizing material whose performance has been deteriorated due to accumulation of substances that have not been removed and used for air purification, and a cleaning process for cleaning the photocatalytic deodorizing material using an acidic aqueous solution, and cleaning A method for producing a regenerated photocatalyst deodorizing material, comprising: irradiating a photocatalyst deodorizing material with light having a wavelength that excites the photocatalyst.
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| JP2000285714A (en) * | 1999-03-30 | 2000-10-13 | Toshiba Lighting & Technology Corp | Luminaire with photocatalyst |
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| JPH0238498A (en) * | 1988-07-28 | 1990-02-07 | Aiko Mizunoya | Surface cleaner |
| JP2000285714A (en) * | 1999-03-30 | 2000-10-13 | Toshiba Lighting & Technology Corp | Luminaire with photocatalyst |
| JP2001121000A (en) * | 1999-10-29 | 2001-05-08 | Tao:Kk | Three-dimensional photocatalyst device and air purifier |
| JP2004041275A (en) * | 2002-07-09 | 2004-02-12 | Mitsubishi Paper Mills Ltd | Deodorizing method |
| JP2004089912A (en) * | 2002-09-02 | 2004-03-25 | Iwasaki Kankyo Shisetsu Kk | Method for washing photocatalyst body |
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